Help-Idle mixture screw location?

[revitup]

Hi guys, I need help locating the idle mixture screw on my 88 Mariner 175. I have a SELOC manual and still can't seem to locate it. Motor seems to be running rich. Thanks for the help.

[dolphinhunter]

If you have the crabs I think you do there us no screw. The idle mix is controlled by jets. My 150 also runs rich at idle with the correct jets in it. I'm nervous about leaning it out. May do it though can smell fuel in the exhaust and the carbs are freshly rebuilt.

[bob1340]

I am going out on a limb as I don't know your motor, but in most cases the idle mixture screw is located at the top of the carb throat. On my little 7.5 it is recessed into the face of the throat. If the motor is running rich at speed this has no effect on it.

[dolphinhunter]

Naah no screw on these (thanks epa). There should be a brass plug on the top on both sides of the carbs. Behind that your idle jets.

[Dave1027]

If you have the crabs I think you do ...

How would you know he has the crabs?

[dolphinhunter]

Should be the same type. I have a service manual and it covers about 6 models over 10 years. Merc didn't like to fix what wasn't broke.

[revitup]

yep. I have 3 carbs. I guess there isn't a idle mixture screw. Thanks for the help.